CAUP Seminar - Chemical Tagging of Stellar Kinematic Groups - 22 maio 2013

Chemical Tagging of Stellar Kinematic Groups 

Hugo Tabernero

Departamento de Astrofísica, UCM

Resumo

Stellar Kinematic Groups are kinematical coherent groups of stars which might share a common origin. These groups spread through the Galaxy over time due to tidal effects caused by galactic rotation and disc heating, however the chemical information survives. The aim of chemical tagging is to show that abundances of every chemical element must be homogeneus among candidate members. We have studied the case of the Hyades Supercluster and the Ursa Major Moving Group for kinematically selected FGK stars, based on high-resolution spectroscopic observations. Stellar atmospheric parameters (Teff, log g, ξ and [Fe/H]) have been determined using an own-implemented automatic code (StePar) which makes use of the sensibility from iron EWs measured in the spectra. We have derived the chemical abundances of several elements and their [X/Fe] ratios. Thus, we finally perform a careful differential abundance analysis using a known member of each group as a reference star, with the aim to clarify the origin of these kinematical groups.

22 de maio de 2013 | 13:30

Local

Centro de Astrofísica da U.P.
Rua das Estrelas
4150-762 Porto